diff --git a/dhp-pace-core/src/main/java/eu/dnetlib/pace/common/AbstractPaceFunctions.java b/dhp-pace-core/src/main/java/eu/dnetlib/pace/common/AbstractPaceFunctions.java
index f21b4d5b3b..248f32e547 100644
--- a/dhp-pace-core/src/main/java/eu/dnetlib/pace/common/AbstractPaceFunctions.java
+++ b/dhp-pace-core/src/main/java/eu/dnetlib/pace/common/AbstractPaceFunctions.java
@@ -67,7 +67,7 @@ public abstract class AbstractPaceFunctions {
 	}
 
 	protected String cleanup(final String s) {
-		final String s1 = HTML_REGEX.matcher(s).replaceAll( "");
+		final String s1 = HTML_REGEX.matcher(s).replaceAll("");
 		final String s2 = unicodeNormalization(s1.toLowerCase());
 		final String s3 = nfd(s2);
 		final String s4 = fixXML(s3);
diff --git a/dhp-pace-core/src/main/java/eu/dnetlib/pace/model/SparkDedupConfig.scala b/dhp-pace-core/src/main/java/eu/dnetlib/pace/model/SparkDedupConfig.scala
index 4a5c4e7aff..286b256efd 100644
--- a/dhp-pace-core/src/main/java/eu/dnetlib/pace/model/SparkDedupConfig.scala
+++ b/dhp-pace-core/src/main/java/eu/dnetlib/pace/model/SparkDedupConfig.scala
@@ -91,7 +91,7 @@ case class SparkDedupConfig(conf: DedupConfig, numPartitions: Int) extends Seria
       } else {
         res
       }
-    })
+    }).checkpoint()
 
     var relBlocks: Dataset[Row] = null
 
@@ -178,8 +178,8 @@ case class SparkDedupConfig(conf: DedupConfig, numPartitions: Int) extends Seria
 
     val res = relBlocks.filter(col("match").equalTo(true))
       .select(col("l.identifier").as("from"), col("r.identifier").as("to"))
-      .repartition()
-      .dropDuplicates()
+      //.repartition()
+      .distinct()
 
    // res.show(false)
     res.select(functions.struct("from", "to"))
diff --git a/dhp-pace-core/src/main/java/eu/dnetlib/pace/tree/JsonListMatch.java b/dhp-pace-core/src/main/java/eu/dnetlib/pace/tree/JsonListMatch.java
index 1f6b76fe6a..3897e37f87 100644
--- a/dhp-pace-core/src/main/java/eu/dnetlib/pace/tree/JsonListMatch.java
+++ b/dhp-pace-core/src/main/java/eu/dnetlib/pace/tree/JsonListMatch.java
@@ -6,19 +6,19 @@ import java.util.Map;
 import java.util.Set;
 import java.util.stream.Collectors;
 
-import com.jayway.jsonpath.Configuration;
-import com.jayway.jsonpath.DocumentContext;
-import com.jayway.jsonpath.Option;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import com.google.common.collect.Sets;
+import com.jayway.jsonpath.Configuration;
+import com.jayway.jsonpath.DocumentContext;
+import com.jayway.jsonpath.JsonPath;
+import com.jayway.jsonpath.Option;
 
 import eu.dnetlib.pace.config.Config;
 import eu.dnetlib.pace.tree.support.AbstractListComparator;
 import eu.dnetlib.pace.tree.support.ComparatorClass;
 import eu.dnetlib.pace.util.MapDocumentUtil;
-import com.jayway.jsonpath.JsonPath;
 
 @ComparatorClass("jsonListMatch")
 public class JsonListMatch extends AbstractListComparator {
@@ -63,7 +63,9 @@ public class JsonListMatch extends AbstractListComparator {
 
 		StringBuilder st = new StringBuilder(); // to build the string used for comparisons basing on the jpath into
 												// parameters
-		final DocumentContext documentContext = JsonPath.using(Configuration.defaultConfiguration().addOptions(Option.SUPPRESS_EXCEPTIONS)).parse(json);
+		final DocumentContext documentContext = JsonPath
+			.using(Configuration.defaultConfiguration().addOptions(Option.SUPPRESS_EXCEPTIONS))
+			.parse(json);
 		// for each path in the param list
 		for (String key : params.keySet().stream().filter(k -> k.contains("jpath")).collect(Collectors.toList())) {
 			String path = params.get(key);
diff --git a/dhp-pace-core/src/main/java/eu/dnetlib/pace/util/BlockProcessor.java b/dhp-pace-core/src/main/java/eu/dnetlib/pace/util/BlockProcessor.java
index 95918a7c74..30606bb9b7 100644
--- a/dhp-pace-core/src/main/java/eu/dnetlib/pace/util/BlockProcessor.java
+++ b/dhp-pace-core/src/main/java/eu/dnetlib/pace/util/BlockProcessor.java
@@ -89,7 +89,7 @@ public class BlockProcessor {
 						break;
 					}
 
-					if (i > wf.getSlidingWindowSize()) {
+					if (++i > wf.getSlidingWindowSize()) {
 						break;
 					}
 
diff --git a/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkCreateSimRels.java b/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkCreateSimRels.java
index d9b71badd8..7c4ab52657 100644
--- a/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkCreateSimRels.java
+++ b/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkCreateSimRels.java
@@ -91,10 +91,10 @@ public class SparkCreateSimRels extends AbstractSparkAction {
 				.textFile(DedupUtility.createEntityPath(graphBasePath, subEntity))
 				.transform(sparkConfig.modelExtractor()) // Extract fields from input json column according to model
 				// definition
-				.transform(sparkConfig.generateClustersWithDFAPI()) // generate <key,block> pairs according to
+				.transform(sparkConfig.generateAndProcessClustersWithJoins()) // generate <key,block> pairs according to
 				// filters, clusters, and model
 				// definition
-				.transform(sparkConfig.processClusters()) // process blocks and emits <from,to> pairs of found
+				// .transform(sparkConfig.processClusters()) // process blocks and emits <from,to> pairs of found
 				// similarities
 				.map(
 					(MapFunction<Row, Relation>) t -> DedupUtility